Fixed selecting int property into enum property #490 (#496)

Author: StefH

src/System.Linq.Dynamic.Core/Parser/TypeHelper.cs

@@ -54,8 +54,8 @@ public static bool IsCompatibleWith(Type source, Type target)
                 return false;
             }
 
-            TypeCode sc = st.GetTypeInfo().IsEnum ? TypeCode.Object : Type.GetTypeCode(st);
-            TypeCode tc = tt.GetTypeInfo().IsEnum ? TypeCode.Object : Type.GetTypeCode(tt);
+            TypeCode sc = st.GetTypeInfo().IsEnum ? TypeCode.Int64 : Type.GetTypeCode(st);
+            TypeCode tc = tt.GetTypeInfo().IsEnum ? TypeCode.Int64 : Type.GetTypeCode(tt);
             switch (sc)
             {
                 case TypeCode.SByte:
@@ -71,6 +71,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.Byte:
                     switch (tc)
                     {
@@ -87,6 +88,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.Int16:
                     switch (tc)
                     {
@@ -99,6 +101,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.UInt16:
                     switch (tc)
                     {
@@ -113,6 +116,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.Int32:
                     switch (tc)
                     {
@@ -124,6 +128,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.UInt32:
                     switch (tc)
                     {
@@ -136,6 +141,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.Int64:
                     switch (tc)
                     {
@@ -146,6 +152,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.UInt64:
                     switch (tc)
                     {
@@ -156,6 +163,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 case TypeCode.Single:
                     switch (tc)
                     {
@@ -164,6 +172,7 @@ public static bool IsCompatibleWith(Type source, Type target)
                             return true;
                     }
                     break;
+
                 default:
                     if (st == tt)
                     {

test/System.Linq.Dynamic.Core.Tests/ExpressionTests.cs

@@ -61,6 +61,16 @@ public class Foo
             public string Two(int x, int y) => null;
         }
 
+        public class SourceClass
+        {
+            public int A { get; set; }
+        }
+
+        public class TargetClass
+        {
+            public TestEnum A { get; set; }
+        }
+
         [Fact]
         public void ExpressionTests_Add_Number()
         {
@@ -598,6 +608,20 @@ public void ExpressionTests_DoubleQualifiers_Negative()
             Assert.Equal(resultValues.ToArray(), result2.ToArray());
         }
 
+        [Fact]
+        public void ExpressionTests_Enum_Cast_Int_To_Enum()
+        {
+            // Arrange
+            var enumvalue = TestEnum.Var1;
+            var qry = new List<SourceClass> { new SourceClass { A = (int)enumvalue } }.AsQueryable();
+
+            // Act
+            var result = qry.Select<TargetClass>("new(A)").ToArray();
+
+            // Assert
+            result.Should().ContainEquivalentOf(new TargetClass { A = enumvalue });
+        }
+
         [Fact]
         public void ExpressionTests_Enum()
         {
@@ -1634,11 +1658,11 @@ public void ExpressionTests_Select_ExpandoObjects()
             dynamic a = new ExpandoObject();
             a.Name = "a";
             a.BlogId = 100;
-            
+
             dynamic b = new ExpandoObject();
             b.Name = "b";
             b.BlogId = 200;
-            
+
             var list = new List<dynamic> { a, b };
             IQueryable qry = list.AsQueryable();